"The GNC's decision to take part in the session came following a series of discussions that concluded that it would be better to hold the meeting outside Libya given the deteriorating security situation, especially after Egyptian warplanes bombed the city of Darnah [on Monday]," the source, requesting anonymity, told The Anadolu Agency.
He added that the GNC had agreed – "for the time being" – to hold the planned talks outside the crisis-hit country.
"The GNC seeks to promote dialogue and prevent schemes by counter-revolutionary forces to impede talks aimed at finding a political solution to Libya's crisis," the source said.
The UN mission in Libya had earlier agreed to hold talks inside Libya based on a previous request by the GNC, which declined to attend previous sessions held in Geneva.
Sharp political divisions in the North African country have recently yielded two rival seats of government in Tripoli and Tobruk, each of which has its own institutions.
On Monday, Egypt carried out airstrikes in Libya's eastern city of Darnah after a video emerged online purporting to show the execution of 21 Egyptian Coptic Christians by Islamic State of Iraq and Levant (ISIL) militants.